A5027067699- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Advanced Frequency and Time Standards
- Quantum Mechanics and Applications
- Quantum Information and Cryptography
- Dark Matter and Cosmic Phenomena
- Geophysics and Sensor Technology
- Quantum optics and atomic interactions
- Mechanical and Optical Resonators
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Analytical Chemistry and Sensors
- Electron and X-Ray Spectroscopy Techniques
- Scientific Measurement and Uncertainty Evaluation
- Quantum, superfluid, helium dynamics
- Relativity and Gravitational Theory
- Advanced Thermodynamics and Statistical Mechanics
- Human Mobility and Location-Based Analysis
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Strong Light-Matter Interactions
- IoT and GPS-based Vehicle Safety Systems
- Stellar, planetary, and galactic studies
- Transportation Planning and Optimization
- Sensor Technology and Measurement Systems
University of California, Los Angeles
2016-2025
University of California System
2021
University of California, Berkeley
2012-2020
Honeywell (United States)
2020
University of Technology, Jamaica
2014
Delta Air Lines (United States)
2014
Yale University
2009-2013
University of Oxford
2011-2012
Harvard University
2003
Center for Astrophysics Harvard & Smithsonian
2002
If dark energy --- which drives the accelerated expansion of universe consists a light scalar field, it might be detectable as "fifth force" between normal-matter objects, in potential conflict with precision tests gravity. Chameleon fields and other theories screening mechanisms, however, can evade these by suppressing forces regions high density, such laboratory. Using cesium matter-wave interferometer near spherical mass an ultra-high vacuum chamber, we reduce mechanism probing field...
Atom interferometry experiments are searching for evidence of chameleon scalar fields with ever-increasing precision. As become more precise, so too must theoretical predictions. Previous work has made numerous approximations to simplify the calculation, which in general requires solving a 3-dimensional nonlinear partial differential equation (PDE). In this paper, we introduce new technique calculating chameleonic force, using numerical relaxation scheme on uniform grid. This is than...
We propose and demonstrate a new scheme for atom interferometry, using light pulses inside an optical cavity as matter wave beamsplitters. The provides power enhancement, spatial filtering, precise beam geometry, enabling techniques such low beamsplitters ($<100 \mathrm{\mu W}$), large momentum transfer with modest power, or self-aligned interferometer geometries utilizing the transverse modes of cavity. As first demonstration, we obtain Ramsey-Raman fringes $>75\%$ contrast measure...
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
Recent observations with the Transition Region and Coronal Explorer (TRACE) have shown that many apparently cool (Te ~ 1-1.5 MK) active region loops are much brighter flatter temperature profiles than static loop models predict. Observations also indicate these can persist longer a characteristic cooling time. Using time-dependent hydrodynamic simulations, we explore possibility actually collection of small-scale filaments been impulsively heated through TRACE 171 Å (Fe IX/X) 195 XII)...
We propose a feasible laboratory interferometry experiment with matter waves in gravitational potential caused by pair of artificial field-generating masses. It will demonstrate that the presence these masses (and, for moving atoms, time dilation) induces phase shift, even if it does not cause any classical force. The shift is identical to produced redshift (or clocks ticking at atom's Compton frequency. In analogy Aharonov-Bohm effect electromagnetism, quantum mechanical function and forces.
We describe a light-pulse atom interferometer that is suitable for any species of and even electrons protons as well their antiparticles, in particular, testing the Einstein equivalence principle with antihydrogen. The design obviates need resonant lasers through far-off Bragg beam splitters makes efficient use scarce atoms by magnetic confinement recycling. expect to reach an initial accuracy better than 1% acceleration free fall antihydrogen, which can be improved part-per million level.
We present results of an experiment to probe for the electric dipole moment (EDM) electron using $\ensuremath{\Omega}$-doublet state in a polar molecule. If molecule is both massive and has large molecular-fixed frame moment, then states have potential greatly increase sensitivity experiments searching EDM while also allowing new methods systematic error rejection. Here, we use metastable $a{(1)}^{3}{\ensuremath{\Sigma}}^{+}$ lead monoxide (PbO) EDM. Our best fit...
A near-minimal instance of optical cooling is experimentally presented, wherein the internal-state entropy a single atom reduced more than twofold by illuminating it with broadband, incoherent light. Since rate pumping thermal state increases monotonically its temperature, power in this scenario higher occupation, an example phenomenon known as heating. In contrast to using coherent, narrow-band laser light, here, we perform same task fiber-coupled, broadband sunlight, brightest...
We present an atom interferometry technique in which the beam splitter is split into two separate operations. A microwave pulse first creates a spin-state superposition, before optical adiabatic passage spatially separates arms of that superposition. Despite using thermal sample small ($600\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$) beam, this procedure delivers efficiency 99% per $\ensuremath{\hbar}k$ momentum separation. Utilizing efficiency, we demonstrate with up to...
Ultralight bosonic dark matter (UBDM) can be described by a classical wave-like field oscillating near the Compton frequency of bosons. If measurement scheme for direct detection UBDM interactions is sensitive to signature quadratic in field, then there near-zero-frequency (dc) component signal. Thus, detector with given finite bandwidth used search bosons frequencies many orders magnitude larger than its bandwidth. This opens possibility analogous Hanbury Brown and Twiss intensity...
We derive constraints on the time variability of coronal heating from observations so-called active region moss by Transition Region and Coronal Explorer (TRACE). The is believed to be due million-degree emission transition regions at footpoints loops whose maximum temperatures are several million degrees. two key results TRACE discussed in this paper that one generally sees only moss, not loops, exhibits weak intensity variations, ~10% over periods hours. movies showing these presented....
We present a protocol for using trapped ions to measure rotations via matter-wave Sagnac interferometry. The trap allows the interferometer enclose large area in compact apparatus through repeated round-trips geometry. show how uniform magnetic field can be used close over dynamic range rotation speed and measurement bandwidth without losing contrast. Since this technique does not require confined Lamb-Dicke regime, thermal states with many phonons should sufficient operation.
Abstract We describe a project that brings together researchers from atomic physics, nuclear physics and sub-atomic particle to develop high-precision laboratory-scale experiment able search for very weakly coupled sterile neutrinos in the mass range extending 5–10 keV/ c 2 several 100 . Observed neutrino flavor eigenstates are known be quantum mixtures of at least three sub-eV/ eigenstates. There is strong theoretical belief there may exist further higher levels, which, if range, might form...
We are pursuing an experiment to measure the electric dipole moment of electron using molecule PbO. This measurement requires ability prepare quantum states with orientation molecular axis and, simultaneously, alignment spin perpendicular this axis. It also efficient detection evolution direction within such a state. describe series experiments that have achieved these goals, and features limitations techniques. discuss possible new approaches for improved efficiency in similar systems.
Public transportation in many countries is being used as a means of transport for travelling and accordingly people would prefer these public to be scheduled properly, on time the frequency increased commuters make good use it. It has been found that quite an amount research work carried out, this sector, by way using RFID technology systems towards tracking passengers when they board exit buses. In addition also out GPS buses along with at traffic lights, bus stops, intersections etc...
Laser cooling to sub-Doppler temperatures by optical molasses is thought be inhibited in atoms with unresolved, near-degenerate hyperfine structure the excited state. We demonstrate that such possible one three dimensions, not only near standard D2 line for laser cooling, but over a range extending D1 line. Via combination of Sisyphus followed adiabatic expansion, we reach as low 40 μK, which corresponds atomic velocities factor 2.6 above limit imposed single photon recoil. Our method...
Abstract Numerous observations suggest that there exist undiscovered beyond‐the‐standard‐model particles and fields. Because of their unknown nature, these exotic fields could interact with standard model in many different ways assume a variety possible configurations. Here, an overview the global network optical magnetometers for physics searches (GNOME), ongoing experimental program designed to test wide range scenarios, is presented. The GNOME experiment utilizes worldwide shielded atomic...
The public transportation system needs some change for satisfying the commuting of general public. These systems are operated by state run authorities or private parties. commuters face challenges as far accessing facility needed. This is mostly attributed to static scheduling bus trips, within pattern, regardless fluctuations in demand. very common many countries and Jamaica not exception this respect. There has been quite an amount research work carried out using Radio Frequency...
Numerous observations suggest that there exist undiscovered beyond-the-Standard-Model particles and fields. Because of their unknown nature, these exotic fields could interact with Standard Model in many different ways assume a variety possible configurations. Here we present an overview the Global Network Optical Magnetometers for Exotic physics searches (GNOME), our ongoing experimental program designed to test wide range scenarios. The GNOME experiment utilizes worldwide network shielded...
We perform entanglement of spin and motional degrees freedom a single, ground-state trapped ion through the application $16\phantom{\rule{0.28em}{0ex}}\mathrm{ps}$ laser pulse. The duration interaction is significantly shorter than both timescale ($30\phantom{\rule{0.28em}{0ex}}\textmu{}\text{s}$) precession ($1\phantom{\rule{0.28em}{0ex}}\text{ns}$), demonstrating that neither sets fundamental speed limit on this operation for quantum information processing. Entanglement demonstrated...
Laser-controlled entanglement between atomic qubits (`spins') and collective motion in trapped ion Coulomb crystals requires conditional momentum transfer from the laser. Since spin-dependent force is derived a spatial gradient spin-light interaction, this typically longitudinal -- parallel proportional to average laser $k$-vector (or two beams' difference), which constrains both direction relative magnitude of accessible spin-motion coupling. Here, we show how can also be transferred...
Abstract Results are reported from the first full-scale search for transient signals exotic fields of astrophysical origin using data a newly constructed Earth-scale detector: Global Network Optical Magnetometers Exotic physics searches (GNOME). Data collected by GNOME consist correlated measurements optical atomic magnetometers located in laboratories all over world. searched patterns propagating through network consistent with composed ultralight bosons such as axion-like particles (ALPs)....
We propose and demonstrate real-time subwavelength cavity QED measurements of the spatial distribution atoms in an optical lattice. Atoms initially confined one ``trap'' standing wave mode are probed with a second ``probe'' wave. With frequencies offset by free spectral range, nodes trap fall on antinodes probe $\ensuremath{\approx}{10}^{4}$ lattice sites around center cavity. This site independent atom-cavity coupling enables high sensitivity detection atom dynamics even spread over many...